Malicious PDF — malware analysis report

Static analysis result for SHA-256 44283bb931aa958e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 09:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f470ca8edf62e8fe641f09a6e7712a74 SHA-1: 8de9ead45e549540e8916b813132be7f3c8fc52e SHA-256: 44283bb931aa958ee930a9e6544b64e6707e2f1bf3bedc745db8dcc8c85803f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of JavaScript, though not explicitly detailed in the provided evidence, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=mulan+full+movie+english+subtitles
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6f233891---sosotivewufaf.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/5850079075.pdf
    • http://allprintusa.com/admin/images/file/75302615974.pdf
    • http://aven.su/userfiles/file/74548155256.pdf
    • http://hanahana.vn/media/ftp/file/23264764942.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/39793287463.pdf
    • http://simonkuehner.de/gfx/userfiles/files/73096586938.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/nonekutujazanejirotejoreg.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/65857225065.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89452001621.pdf
    • http://a-xian-coat.com/uploads/files/202109140047058922.pdf
    • http://sharon-barron.com/userfiles/files/vejisunijezodofa.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/wegurirofusesaketa.pdf
    • https://kingdom.vn/userfiles/file/72123820164.pdf
    • https://rh-h1tapi-turbo.com/contents/files/34528759618.pdf
    • https://cartolmania.it/file/lirejorujidodesudavusu.pdf
    • http://szigmetal.hu/editor_up/xelotarin.pdf
    • http://bestbuyfromindia.com/userfiles/file/44685978729.pdf
    • https://interconformity.ro/images/file/kawogodeb.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/gawaxenulavuvokul.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/xefinebadolimuv.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ac65f6d70994436f43941a3ca2880e3d/xiluwexixipaxugufefan.pdf
    • https://mamap.in/ci/userfiles/files/52280971315.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2d.bin
00931a1257366f226b63e4f94822460878060d5fa9569eeecb08fc9ccee9baa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 19960 bytes
font_01_sfnt_off000121e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 16792 bytes
font_02_sfnt_off000139fb.bin
33efb944940147e30afd74660957ac0611759204751ca565763568a176d5991f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 10860 bytes

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